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| author | Eric Biggers <ebiggers@google.com> | 2017-06-08 14:49:49 +0100 |
|---|---|---|
| committer | James Morris <james.l.morris@oracle.com> | 2017-06-09 13:29:49 +1000 |
| commit | 0ddd9f1a6b7e5746b52959f645fc66859b805e88 (patch) | |
| tree | d9a9c465c41a379ae416f84e95ccf9a0dd84d5d0 /security | |
| parent | 281590b4221779dbc4a5e2c33c0c5b0239cfe794 (diff) | |
| download | linux-0-day-0ddd9f1a6b7e5746b52959f645fc66859b805e88.tar.gz linux-0-day-0ddd9f1a6b7e5746b52959f645fc66859b805e88.tar.xz | |
KEYS: DH: ensure the KDF counter is properly aligned
Accessing a 'u8[4]' through a '__be32 *' violates alignment rules. Just
make the counter a __be32 instead.
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: James Morris <james.l.morris@oracle.com>
Diffstat (limited to 'security')
| -rw-r--r-- | security/keys/dh.c | 16 |
1 files changed, 3 insertions, 13 deletions
diff --git a/security/keys/dh.c b/security/keys/dh.c index 1c1cac6770410..63ac87d430db5 100644 --- a/security/keys/dh.c +++ b/security/keys/dh.c @@ -130,14 +130,6 @@ static void kdf_dealloc(struct kdf_sdesc *sdesc) kzfree(sdesc); } -/* convert 32 bit integer into its string representation */ -static inline void crypto_kw_cpu_to_be32(u32 val, u8 *buf) -{ - __be32 *a = (__be32 *)buf; - - *a = cpu_to_be32(val); -} - /* * Implementation of the KDF in counter mode according to SP800-108 section 5.1 * as well as SP800-56A section 5.8.1 (Single-step KDF). @@ -154,16 +146,14 @@ static int kdf_ctr(struct kdf_sdesc *sdesc, const u8 *src, unsigned int slen, unsigned int h = crypto_shash_digestsize(desc->tfm); int err = 0; u8 *dst_orig = dst; - u32 i = 1; - u8 iteration[sizeof(u32)]; + __be32 counter = cpu_to_be32(1); while (dlen) { err = crypto_shash_init(desc); if (err) goto err; - crypto_kw_cpu_to_be32(i, iteration); - err = crypto_shash_update(desc, iteration, sizeof(u32)); + err = crypto_shash_update(desc, (u8 *)&counter, sizeof(__be32)); if (err) goto err; @@ -189,7 +179,7 @@ static int kdf_ctr(struct kdf_sdesc *sdesc, const u8 *src, unsigned int slen, dlen -= h; dst += h; - i++; + counter = cpu_to_be32(be32_to_cpu(counter) + 1); } } |